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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adc7e629bfff54786a5c08da26b378f48b899e807ca7450c19b99e5d0b3fa4f' 
  AND token = 'kRNrf6CcvAF6L3qlKWwch2XkIh0fzCXHT2TyLX5siFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}